Commit dc633700 authored by Zhengchao Shao's avatar Zhengchao Shao Committed by David S. Miller

net/af_packet: check len when min_header_len equals to 0

User can use AF_PACKET socket to send packets with the length of 0.
When min_header_len equals to 0, packet_snd will call __dev_queue_xmit
to send packets, and sock->type can be any type.

Reported-by: syzbot+5ea725c25d06fb9114c4@syzkaller.appspotmail.com
Fixes: fd189422 ("bpf: Don't redirect packets with invalid pkt_len")
Signed-off-by: default avatarZhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3b1c3147
...@@ -3037,8 +3037,8 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) ...@@ -3037,8 +3037,8 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
if (err) if (err)
goto out_free; goto out_free;
if (sock->type == SOCK_RAW && if ((sock->type == SOCK_RAW &&
!dev_validate_header(dev, skb->data, len)) { !dev_validate_header(dev, skb->data, len)) || !skb->len) {
err = -EINVAL; err = -EINVAL;
goto out_free; goto out_free;
} }
......
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